Polyester modified organosilicon levelling agent, and preparation method thereof

A silicone leveling agent, polyester modification technology, applied in the direction of coating and other directions, can solve the problems of easy loss of effective substances, weak bonding force between leveling agent and resin, poor heat resistance, etc., and achieves a simple and easy preparation method. The effect of the line, convenient for industrial production, excellent leveling effect

Active Publication Date: 2018-02-09
优卡化学(上海)有限公司 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, at present, polyether compounds are mostly used for organic modification of silicone, which has poor heat resistance and is not suitable for high temperature resistant systems. In addition, the binding force between leveling agent and resin is not strong, and the effective substances floating on the surface after film formation Loss, poor long-term effect

Method used

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  • Polyester modified organosilicon levelling agent, and preparation method thereof

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preparation example Construction

[0026] The preparation method of above-mentioned polyester modified silicone leveling agent, comprises the steps:

[0027] 1) Mix hydrogen-terminated polydimethylsiloxane with single-ended allyl polycaprolactone, and add solvent until the mixture is clear;

[0028] 2) Warm up the solution obtained in step 1) to 60-90°C, add Karstedt catalyst, and stir for 3-10 hours;

[0029] 3) Separating the reaction solution in step 2) to remove the supernatant, and distilling off low boilers under reduced pressure to obtain a polyester-modified silicone leveling agent.

[0030] The solvent is selected from one of toluene, ethyl acetate, isopropanol and tetrahydrofuran.

Embodiment 1

[0032] Mix 1 mole part of hydrogen-terminated polydimethylsiloxane (molecular weight 652, m=7) with 2 mole parts of single-ended allyl polycaprolactone (molecular weight 686, n=5), add toluene until the mixture is clear, Heat up to 90°C, add Karstedt catalyst (accounting for 0.005% of the total material mass fraction), stir and react for 3 hours, separate liquid to take the lower layer clear liquid, vacuum 0.09MPa vacuum distillation to remove low boilers, and obtain polyester modified silicone fluid leveling agent.

Embodiment 2

[0034] Mix 1.1 molar parts of hydrogen-terminated polydimethylsiloxane (molecular weight 874, m=10) with 2 molar parts of single-ended allyl polycaprolactone (molecular weight 344, n=2), and add ethyl acetate until the mixture To clarify, heat up to 70°C, add Karstedt catalyst (accounting for 0.002% of the total material mass fraction), stir and react for 6 hours, separate the liquid to remove the lower layer, and remove the low boilers by distillation under reduced pressure at a vacuum degree of 0.09MPa to obtain a polyester modified organic compound. Silicon leveling agent.

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Abstract

The invention discloses a polyester modified organosilicon levelling agent, and a preparation method thereof. According to the preparation method, the polyester modified organosilicon levelling agentis prepared from hydrogen-terminal polydimethylsiloxane and single-allyl-terminal polycaprolactone at a molar ratio of 1-1.5:2 via catalytic addition under the action of a catalyst, wherein the mass amount of the catalyst accounts for 0.001 to 0.005% of that of the total materials. Primary hydroxyl groups contained by the polyester modified organosilicon levelling agent are capable of reacting with a resin base material, anchoring of active components on coating surface is realized after film forming, excellent heat resistance is achieved, and applications can be realized in the forms of solution, water miscible liquid, or 100% stock solution.

Description

technical field [0001] The invention relates to the field of chemical synthesis of new materials, in particular to a polyester modified silicone leveling agent and a preparation method thereof. Background technique [0002] Leveling agent is a commonly used coating additive. It is a surface active substance that can be oriented at the liquid / air interface. It has limited compatibility with the coating system and is easy to migrate to the surface of the coating film during the coating process. A layer of low surface energy interface, so as to control the surface state of the coating film, and avoid problems such as orange peel, shrinkage cavity, floating color, sagging, brush marks and other problems on the surface of the coating film. Depending on their chemical structure, leveling agents with this surface control capability can be divided into three major categories: acrylics, silicones, and fluorocarbons. Silicone-based leveling agents have good substrate wetting and anti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D7/47C08G77/445
CPCC08G77/445
Inventor 王锋施丹
Owner 优卡化学(上海)有限公司
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